Dna is wrapped around histones, which contain many copies of the positive amino acids lysine and arginine. these positive amino acids neutralize the negative charge of the of the dna wrapped around the histone.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.